code: def test_diff_no_params(tmp_dir, scm, dvc):
      assert dvc.params.diff() == {}
  
file_path: dvc/tests/func/params/test_diff.py
imports: from os.path import join
  import pytest
  from dvc.utils import relpath
label_desc: Use image node_id 1 for calling a global function with example usage: test_diff_no_params(tmp_dir, scm, dvc) without return types